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## JSS2: BASIC SCIENCE - 1ST TERM

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Lesson 5, Topic 1
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# Meaning of Work, Energy and Power

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#### Topic Content:

• Definition of Work
• Joules Converter
• Calculations Involving Work done
• Definition of Power
• Calculations Involving Power
• Watt Converter
• Definition of Energy
• Calculations Involving Energy

### What is Work?

Work can be defined as the product of force and distance through which an object moves in the direction of force applied.

Work (W) = Force (F) Ã— distance (D)

= Newton Ã— metre

= Joule (J)

âˆ´ 1 J = 1 Nm

If the object doesn’t move, then no work is done.

Where Force is the product of mass and gravity or mass and acceleration (F = mg, or F = ma) (g = 10 m/s2)

The unit of work is Joule named after the scientist, James Prescott Joule, who did a lot of experiments with energy.

In the illustration above, the work done is the product of the force (12N) used to push the box and the distance (5m).

= 12 N Ã— 5 m = 60 J

Joules Converter:

Larger units are KiloJoule (KJ) and MegaJoule (MJ)

1,000 Joules (J) = 1 KiloJoule (KJ)

1,000,000 Joules (J) = 1 MegaJoule (MJ)

1,000 KiloJoules (KJ) = 1 MegaJoule (MJ)

### Example 1

If a force of 20 N is used to pull a Wheelbarrow through a distance of 8 m. How much work is done in the process.

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#### Responses

1. Amazing. Thanks a lot for this

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